Sorry it took me so long. Igo through all my orders. This should be the tubing I used and these are the baby bottle nipples.

I know for sure those are the baby bottle nipples, but that tubing might not be the one I used. It might be too stiff. If it is, you can return it for a full refund and let me know and I'll send you more links. I ordered several types of tubing at once for this and I can't remember which one was which.